What is system mapping?

System mapping is a concept in personal epistemology: When you draw all the relationships between elements the system structure becomes visible.

Example: In 1932, psychiatrist Jacob Moreno asked every girl at the New York State Training School for Girls in Hudson to name which other girls she wanted to live with. Then he drew the answers — each girl a circle, each choice an arrow. The resulting diagram, which Moreno called a sociogram, revealed what no administrator had seen: the recent epidemic of runaways could be explained by chains of attraction and repulsion that crossed dormitory boundaries. The girls weren't running away from the institution. They were running toward people the institutional structure had separated them from. The individual facts — each girl's preference — were already known. But only when Moreno mapped every relationship at once did the system's actual social structure become visible. Stars emerged (girls chosen by many), isolates appeared (girls chosen by none), and tightly bonded cliques revealed themselves as the real organizational units, invisible on any formal chart.

This concept is part of Phase 13 (Relationship Mapping) in the How to Think curriculum, which builds the epistemic infrastructure for relationship mapping.